OK, let's work through this together. We're starting with 340 and we're going to multiply it by 388, which means we add 340 to itself 388 times.
Step 1: 0 + 340 = 340
Step 2: 340 + 340 = 680
Step 3: 680 + 340 = 1020
Step 4: 1020 + 340 = 1360
Step 5: 1360 + 340 = 1700
Step 6: 1700 + 340 = 2040
Step 7: 2040 + 340 = 2380
Step 8: 2380 + 340 = 2720
Step 9: 2720 + 340 = 3060
Step 10: 3060 + 340 = 3400
Step 11: 3400 + 340 = 3740
Step 12: 3740 + 340 = 4080
Step 13: 4080 + 340 = 4420
Step 14: 4420 + 340 = 4760
Step 15: 4760 + 340 = 5100
Step 16: 5100 + 340 = 5440
Step 17: 5440 + 340 = 5780
Step 18: 5780 + 340 = 6120
Step 19: 6120 + 340 = 6460
Step 20: 6460 + 340 = 6800
Step 21: 6800 + 340 = 7140
Step 22: 7140 + 340 = 7480
Step 23: 7480 + 340 = 7820
Step 24: 7820 + 340 = 8160
Step 25: 8160 + 340 = 8500
Step 26: 8500 + 340 = 8840
Step 27: 8840 + 340 = 9180
Step 28: 9180 + 340 = 9520
Step 29: 9520 + 340 = 9860
Step 30: 9860 + 340 = 10200
Step 31: 10200 + 340 = 10540
Step 32: 10540 + 340 = 10880
Step 33: 10880 + 340 = 11220
Step 34: 11220 + 340 = 11560
Step 35: 11560 + 340 = 11900
Step 36: 11900 + 340 = 12240
Step 37: 12240 + 340 = 12580
Step 38: 12580 + 340 = 12920
Step 39: 12920 + 340 = 13260
Step 40: 13260 + 340 = 13600
Step 41: 13600 + 340 = 13940
Step 42: 13940 + 340 = 14280
Step 43: 14280 + 340 = 14620
Step 44: 14620 + 340 = 14960
Step 45: 14960 + 340 = 15300
Step 46: 15300 + 340 = 15640
Step 47: 15640 + 340 = 15980
Step 48: 15980 + 340 = 16320
Step 49: 16320 + 340 = 16660
Step 50: 16660 + 340 = 17000
Step 51: 17000 + 340 = 17340
Step 52: 17340 + 340 = 17680
Step 53: 17680 + 340 = 18020
Step 54: 18020 + 340 = 18360
Step 55: 18360 + 340 = 18700
Step 56: 18700 + 340 = 19040
Step 57: 19040 + 340 = 19380
Step 58: 19380 + 340 = 19720
Step 59: 19720 + 340 = 20060
Step 60: 20060 + 340 = 20400
Step 61: 20400 + 340 = 20740
Step 62: 20740 + 340 = 21080
Step 63: 21080 + 340 = 21420
Step 64: 21420 + 340 = 21760
Step 65: 21760 + 340 = 22100
Step 66: 22100 + 340 = 22440
Step 67: 22440 + 340 = 22780
Step 68: 22780 + 340 = 23120
Step 69: 23120 + 340 = 23460
Step 70: 23460 + 340 = 23800
Step 71: 23800 + 340 = 24140
Step 72: 24140 + 340 = 24480
Step 73: 24480 + 340 = 24820
Step 74: 24820 + 340 = 25160
Step 75: 25160 + 340 = 25500
Step 76: 25500 + 340 = 25840
Step 77: 25840 + 340 = 26180
Step 78: 26180 + 340 = 26520
Step 79: 26520 + 340 = 26860
Step 80: 26860 + 340 = 27200
Step 81: 27200 + 340 = 27540
Step 82: 27540 + 340 = 27880
Step 83: 27880 + 340 = 28220
Step 84: 28220 + 340 = 28560
Step 85: 28560 + 340 = 28900
Step 86: 28900 + 340 = 29240
Step 87: 29240 + 340 = 29580
Step 88: 29580 + 340 = 29920
Step 89: 29920 + 340 = 30260
Step 90: 30260 + 340 = 30600
Step 91: 30600 + 340 = 30940
Step 92: 30940 + 340 = 31280
Step 93: 31280 + 340 = 31620
Step 94: 31620 + 340 = 31960
Step 95: 31960 + 340 = 32300
Step 96: 32300 + 340 = 32640
Step 97: 32640 + 340 = 32980
Step 98: 32980 + 340 = 33320
Step 99: 33320 + 340 = 33660
Step 100: 33660 + 340 = 34000
Step 101: 34000 + 340 = 34340
Step 102: 34340 + 340 = 34680
Step 103: 34680 + 340 = 35020
Step 104: 35020 + 340 = 35360
Step 105: 35360 + 340 = 35700
Step 106: 35700 + 340 = 36040
Step 107: 36040 + 340 = 36380
Step 108: 36380 + 340 = 36720
Step 109: 36720 + 340 = 37060
Step 110: 37060 + 340 = 37400
Step 111: 37400 + 340 = 37740
Step 112: 37740 + 340 = 38080
Step 113: 38080 + 340 = 38420
Step 114: 38420 + 340 = 38760
Step 115: 38760 + 340 = 39100
Step 116: 39100 + 340 = 39440
Step 117: 39440 + 340 = 39780
Step 118: 39780 + 340 = 40120
Step 119: 40120 + 340 = 40460
Step 120: 40460 + 340 = 40800
Step 121: 40800 + 340 = 41140
Step 122: 41140 + 340 = 41480
Step 123: 41480 + 340 = 41820
Step 124: 41820 + 340 = 42160
Step 125: 42160 + 340 = 42500
Step 126: 42500 + 340 = 42840
Step 127: 42840 + 340 = 43180
Step 128: 43180 + 340 = 43520
Step 129: 43520 + 340 = 43860
Step 130: 43860 + 340 = 44200
Step 131: 44200 + 340 = 44540
Step 132: 44540 + 340 = 44880
Step 133: 44880 + 340 = 45220
Step 134: 45220 + 340 = 45560
Step 135: 45560 + 340 = 45900
Step 136: 45900 + 340 = 46240
Step 137: 46240 + 340 = 46580
Step 138: 46580 + 340 = 46920
Step 139: 46920 + 340 = 47260
Step 140: 47260 + 340 = 47600
Step 141: 47600 + 340 = 47940
Step 142: 47940 + 340 = 48280
Step 143: 48280 + 340 = 48620
Step 144: 48620 + 340 = 48960
Step 145: 48960 + 340 = 49300
Step 146: 49300 + 340 = 49640
Step 147: 49640 + 340 = 49980
Step 148: 49980 + 340 = 50320
Step 149: 50320 + 340 = 50660
Step 150: 50660 + 340 = 51000
Step 151: 51000 + 340 = 51340
Step 152: 51340 + 340 = 51680
Step 153: 51680 + 340 = 52020
Step 154: 52020 + 340 = 52360
Step 155: 52360 + 340 = 52700
Step 156: 52700 + 340 = 53040
Step 157: 53040 + 340 = 53380
Step 158: 53380 + 340 = 53720
Step 159: 53720 + 340 = 54060
Step 160: 54060 + 340 = 54400
Step 161: 54400 + 340 = 54740
Step 162: 54740 + 340 = 55080
Step 163: 55080 + 340 = 55420
Step 164: 55420 + 340 = 55760
Step 165: 55760 + 340 = 56100
Step 166: 56100 + 340 = 56440
Step 167: 56440 + 340 = 56780
Step 168: 56780 + 340 = 57120
Step 169: 57120 + 340 = 57460
Step 170: 57460 + 340 = 57800
Step 171: 57800 + 340 = 58140
Step 172: 58140 + 340 = 58480
Step 173: 58480 + 340 = 58820
Step 174: 58820 + 340 = 59160
Step 175: 59160 + 340 = 59500
Step 176: 59500 + 340 = 59840
Step 177: 59840 + 340 = 60180
Step 178: 60180 + 340 = 60520
Step 179: 60520 + 340 = 60860
Step 180: 60860 + 340 = 61200
Step 181: 61200 + 340 = 61540
Step 182: 61540 + 340 = 61880
Step 183: 61880 + 340 = 62220
Step 184: 62220 + 340 = 62560
Step 185: 62560 + 340 = 62900
Step 186: 62900 + 340 = 63240
Step 187: 63240 + 340 = 63580
Step 188: 63580 + 340 = 63920
Step 189: 63920 + 340 = 64260
Step 190: 64260 + 340 = 64600
Step 191: 64600 + 340 = 64940
Step 192: 64940 + 340 = 65280
Step 193: 65280 + 340 = 65620
Step 194: 65620 + 340 = 65960
Step 195: 65960 + 340 = 66300
Step 196: 66300 + 340 = 66640
Step 197: 66640 + 340 = 66980
Step 198: 66980 + 340 = 67320
Step 199: 67320 + 340 = 67660
Step 200: 67660 + 340 = 68000
Step 201: 68000 + 340 = 68340
Step 202: 68340 + 340 = 68680
Step 203: 68680 + 340 = 69020
Step 204: 69020 + 340 = 69360
Step 205: 69360 + 340 = 69700
Step 206: 69700 + 340 = 70040
Step 207: 70040 + 340 = 70380
Step 208: 70380 + 340 = 70720
Step 209: 70720 + 340 = 71060
Step 210: 71060 + 340 = 71400
Step 211: 71400 + 340 = 71740
Step 212: 71740 + 340 = 72080
Step 213: 72080 + 340 = 72420
Step 214: 72420 + 340 = 72760
Step 215: 72760 + 340 = 73100
Step 216: 73100 + 340 = 73440
Step 217: 73440 + 340 = 73780
Step 218: 73780 + 340 = 74120
Step 219: 74120 + 340 = 74460
Step 220: 74460 + 340 = 74800
Step 221: 74800 + 340 = 75140
Step 222: 75140 + 340 = 75480
Step 223: 75480 + 340 = 75820
Step 224: 75820 + 340 = 76160
Step 225: 76160 + 340 = 76500
Step 226: 76500 + 340 = 76840
Step 227: 76840 + 340 = 77180
Step 228: 77180 + 340 = 77520
Step 229: 77520 + 340 = 77860
Step 230: 77860 + 340 = 78200
Step 231: 78200 + 340 = 78540
Step 232: 78540 + 340 = 78880
Step 233: 78880 + 340 = 79220
Step 234: 79220 + 340 = 79560
Step 235: 79560 + 340 = 79900
Step 236: 79900 + 340 = 80240
Step 237: 80240 + 340 = 80580
Step 238: 80580 + 340 = 80920
Step 239: 80920 + 340 = 81260
Step 240: 81260 + 340 = 81600
Step 241: 81600 + 340 = 81940
Step 242: 81940 + 340 = 82280
Step 243: 82280 + 340 = 82620
Step 244: 82620 + 340 = 82960
Step 245: 82960 + 340 = 83300
Step 246: 83300 + 340 = 83640
Step 247: 83640 + 340 = 83980
Step 248: 83980 + 340 = 84320
Step 249: 84320 + 340 = 84660
Step 250: 84660 + 340 = 85000
Step 251: 85000 + 340 = 85340
Step 252: 85340 + 340 = 85680
Step 253: 85680 + 340 = 86020
Step 254: 86020 + 340 = 86360
Step 255: 86360 + 340 = 86700
Step 256: 86700 + 340 = 87040
Step 257: 87040 + 340 = 87380
Step 258: 87380 + 340 = 87720
Step 259: 87720 + 340 = 88060
Step 260: 88060 + 340 = 88400
Step 261: 88400 + 340 = 88740
Step 262: 88740 + 340 = 89080
Step 263: 89080 + 340 = 89420
Step 264: 89420 + 340 = 89760
Step 265: 89760 + 340 = 90100
Step 266: 90100 + 340 = 90440
Step 267: 90440 + 340 = 90780
Step 268: 90780 + 340 = 91120
Step 269: 91120 + 340 = 91460
Step 270: 91460 + 340 = 91800
Step 271: 91800 + 340 = 92140
Step 272: 92140 + 340 = 92480
Step 273: 92480 + 340 = 92820
Step 274: 92820 + 340 = 93160
Step 275: 93160 + 340 = 93500
Step 276: 93500 + 340 = 93840
Step 277: 93840 + 340 = 94180
Step 278: 94180 + 340 = 94520
Step 279: 94520 + 340 = 94860
Step 280: 94860 + 340 = 95200
Step 281: 95200 + 340 = 95540
Step 282: 95540 + 340 = 95880
Step 283: 95880 + 340 = 96220
Step 284: 96220 + 340 = 96560
Step 285: 96560 + 340 = 96900
Step 286: 96900 + 340 = 97240
Step 287: 97240 + 340 = 97580
Step 288: 97580 + 340 = 97920
Step 289: 97920 + 340 = 98260
Step 290: 98260 + 340 = 98600
Step 291: 98600 + 340 = 98940
Step 292: 98940 + 340 = 99280
Step 293: 99280 + 340 = 99620
Step 294: 99620 + 340 = 99960
Step 295: 99960 + 340 = 100300
Step 296: 100300 + 340 = 100640
Step 297: 100640 + 340 = 100980
Step 298: 100980 + 340 = 101320
Step 299: 101320 + 340 = 101660
Step 300: 101660 + 340 = 102000
Step 301: 102000 + 340 = 102340
Step 302: 102340 + 340 = 102680
Step 303: 102680 + 340 = 103020
Step 304: 103020 + 340 = 103360
Step 305: 103360 + 340 = 103700
Step 306: 103700 + 340 = 104040
Step 307: 104040 + 340 = 104380
Step 308: 104380 + 340 = 104720
Step 309: 104720 + 340 = 105060
Step 310: 105060 + 340 = 105400
Step 311: 105400 + 340 = 105740
Step 312: 105740 + 340 = 106080
Step 313: 106080 + 340 = 106420
Step 314: 106420 + 340 = 106760
Step 315: 106760 + 340 = 107100
Step 316: 107100 + 340 = 107440
Step 317: 107440 + 340 = 107780
Step 318: 107780 + 340 = 108120
Step 319: 108120 + 340 = 108460
Step 320: 108460 + 340 = 108800
Step 321: 108800 + 340 = 109140
Step 322: 109140 + 340 = 109480
Step 323: 109480 + 340 = 109820
Step 324: 109820 + 340 = 110160
Step 325: 110160 + 340 = 110500
Step 326: 110500 + 340 = 110840
Step 327: 110840 + 340 = 111180
Step 328: 111180 + 340 = 111520
Step 329: 111520 + 340 = 111860
Step 330: 111860 + 340 = 112200
Step 331: 112200 + 340 = 112540
Step 332: 112540 + 340 = 112880
Step 333: 112880 + 340 = 113220
Step 334: 113220 + 340 = 113560
Step 335: 113560 + 340 = 113900
Step 336: 113900 + 340 = 114240
Step 337: 114240 + 340 = 114580
Step 338: 114580 + 340 = 114920
Step 339: 114920 + 340 = 115260
Step 340: 115260 + 340 = 115600
Step 341: 115600 + 340 = 115940
Step 342: 115940 + 340 = 116280
Step 343: 116280 + 340 = 116620
Step 344: 116620 + 340 = 116960
Step 345: 116960 + 340 = 117300
Step 346: 117300 + 340 = 117640
Step 347: 117640 + 340 = 117980
Step 348: 117980 + 340 = 118320
Step 349: 118320 + 340 = 118660
Step 350: 118660 + 340 = 119000
Step 351: 119000 + 340 = 119340
Step 352: 119340 + 340 = 119680
Step 353: 119680 + 340 = 120020
Step 354: 120020 + 340 = 120360
Step 355: 120360 + 340 = 120700
Step 356: 120700 + 340 = 121040
Step 357: 121040 + 340 = 121380
Step 358: 121380 + 340 = 121720
Step 359: 121720 + 340 = 122060
Step 360: 122060 + 340 = 122400
Step 361: 122400 + 340 = 122740
Step 362: 122740 + 340 = 123080
Step 363: 123080 + 340 = 123420
Step 364: 123420 + 340 = 123760
Step 365: 123760 + 340 = 124100
Step 366: 124100 + 340 = 124440
Step 367: 124440 + 340 = 124780
Step 368: 124780 + 340 = 125120
Step 369: 125120 + 340 = 125460
Step 370: 125460 + 340 = 125800
Step 371: 125800 + 340 = 126140
Step 372: 126140 + 340 = 126480
Step 373: 126480 + 340 = 126820
Step 374: 126820 + 340 = 127160
Step 375: 127160 + 340 = 127500
Step 376: 127500 + 340 = 127840
Step 377: 127840 + 340 = 128180
Step 378: 128180 + 340 = 128520
Step 379: 128520 + 340 = 128860
Step 380: 128860 + 340 = 129200
Step 381: 129200 + 340 = 129540
Step 382: 129540 + 340 = 129880
Step 383: 129880 + 340 = 130220
Step 384: 130220 + 340 = 130560
Step 385: 130560 + 340 = 130900
Step 386: 130900 + 340 = 131240
Step 387: 131240 + 340 = 131580
Step 388: 131580 + 340 = 131920

So, 340*388 = 131920